Author(s): Hong-Yan Ji, Cai-E Wu, Jian-Zhong Yuan
Linked Author(s): Hongyan Ji
Keywords: Qingcaosha Reservoir, water supply safety, eutrophication pre-control operation, water and sediment dispatching, operation system
Abstract: As the largest water source in Shanghai, the water supply safety of the Qingcaosha Reservoir is of great importance and it is located at the estuary of the Yangtze River. The water quality of the reservoir is restrained not only by the water quantity and quality of the upstream, but also by the water environment of the estuarine area and the salinity changes. Due to the numerous influential factors and the high potential environmental risk, it has the characteristics of long-term, sudden and uncertainty. Meanwhile, Qingcaosha Reservoir also has the characteristics of the shallow lake because of the high nutrient source (e. x. phosphorus) in the Yangtze River. After the completion of the reservoir, the velocity of the water flow declines, the reservoir water residence time increases, and backwater area exists in some parts. This paper aims at the eutrophication and water bloom pre-control problems of the large shallow estuary reservoir, combined with the actual situation of Qingcaosha Reservoir, and according to the latest research results of Qingcaosha Reservoir sediment release pattern and optimal residence time. In order to conduct the research respectively on aspects such as, Hydrologic and Sediment Monitoring & Research of the law of water and sediment at the reservoir entrance, Optimization of reservoir dispatching scheme, Drainage and self-purification strengthening technology, Emergency dispatching operation scheme and Sediment control & siltation promotion measures are proposed to form a water and sediment dispatching operation system based on eutrophication pre-control, which is of "one frame, three kinds of operation mode, the four measures". In order to guide the dispatching operation of the Qingcaosha Reservoir, and pre-control the reservoir eutrophication, this system improves the water quality and ensures the water supply safety of the reservoir
Year: 2017